Calumet, Cambo, etc) made special bellows supports that clipped onto the monorail and had a cross bar of heavy wire that pushed up against the bottom of the bellows (adjustable as well) for just this purpose. If you are in the field with a field camera, shove a couple of film holders under the bellows to achieve the same solution. With a monorail, a big office binder clip may fit over the rail and give you a base upon which to place a spacer to again hold it up.
Many cameras have also been made with the rings at stages along the sides or top and bottom of the bellows and with matching hooks on the front standard so that the photographer could stretch the bellow tight enough to remove the sag.
If you plan to do that, I would consider riveting the leather strip holding the rings through one pleat of the bellows rather than using glue. I tried it the glue version and ended up with bad damage when the glue tore loose and removed a significant portion of the top layer of the leather. Find an illustration from the manual for a Kodak 8x10 Master camera (butkus.org) to see how the rings and hooks were set up on that very successful version.
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